<template>
  <div :class="keyboardClass"></div>
</template>
<script>
import Keyboard from 'simple-keyboard'
import 'simple-keyboard/build/css/index.css'
import layout from 'simple-keyboard-layouts/build/layouts/chinese' // 中文字库
export default {
  name: 'SimpleKeyboard',
  props: {
    keyboardClass: {
      default: 'simple-keyboard',
      type: String,
    },
    maxLength: {default: ''},
  },
  data: () => ({
    keyboard: null,
    displayDefault: {
      '{bksp}': 'backspace',
      '{lock}': '切换',
      '{enter}': '←┘enter',
      '{tab}': 'tab',
      '{shift}': 'shift',
      '{change}': '中文',
      '{space}': ' ',
      '{clear}': '清空',
      '{close}': '关闭'
    }
  }),
  mounted() {
    this.keyboard = new Keyboard(this.keyboardClass, {
      onChange: this.onChange,
      onKeyPress: this.onKeyPress,
      layoutCandidates: layout.layoutCandidates,
      layout: {
        // 默认布局
        default: [
          '` 1 2 3 4 5 6 7 8 9 0 - = {bksp}',
          '{tab} q w e r t y u i o p [ ] \\',
          "{lock} a s d f g h j k l ; ' {enter}",
          '{shift} z x c v b n m , . / {clear}',
          '{change} {space} {close}',
        ],
        // shift布局
        shift: [
          '~ ! @ # $ % ^ & * ( ) _ + {bksp}',
          '{tab} Q W E R T Y U I O P { } |',
          '{lock} A S D F G H J K L : " {enter}',
          '{shift} Z X C V B N M < > ? {clear}',
          '{change} {space} {close}',
        ],
      },
      // 按钮展示文字
      // display: this.displayDefault,
      display: {
        "{enter}": "close",
        "{shift}": "shift",
        "{bksp}": "del",
        "{tab}": "tab",
        "{space}": "space",
        "{lock}": "caps",
      },
      // 按钮样式
      buttonTheme: [
        {
          class: 'hg-red close',
          buttons: '{close}',
        },
        {
          class: 'change',
          buttons: '{change}',
        },
      ],
      // 输入限制长度
      maxLength: this.maxLength,
    })
  },
  methods: {
    onChange(input) {
      this.$emit('onChange', input) // 输入值向外传递
    },
    // 重写清空按钮
    onChangeKey() {
      this.keyboard.setInput('')
      this.$emit('empty')
    },
    // @focus 触发时赋值 封装组件调用
    onChangeFocus(value) {
      this.keyboard.setInput(value)

    },
    // 点击键盘
    onKeyPress(button, $event) {
      // 点击关闭
      if (button === '{close}') {
        // 子组件调用父组件的关闭按钮方法
        this.$parent.closekeyboard()
        return false
      } else if (button === '{change}') {
        // 切换中英文输入法
        if (this.keyboard.options.layoutCandidates !== null) {
          this.$set(this.displayDefault, '{change}', '英文')
          // 切换至英文
          this.keyboard.setOptions({
            layoutCandidates: null,
            display: this.displayDefault,
          })
        } else {
          // 切换至中文
          this.$set(this.displayDefault, '{change}', '中文')
          this.keyboard.setOptions({
            layoutCandidates: layout.layoutCandidates,
            display: this.displayDefault,
          })
        }
      } else if (button === '{clear}') {
        this.onChangeKey()
      } else {
        let value = $event.target.offsetParent.parentElement.children[0].children[0].value
        // 输入框有默认值时，覆写
        if (value) {
          this.keyboard.setInput(value)
        }
        this.$emit('onKeyPress', button)
      }
      if (button === '{shift}' || button === '{lock}') this.handleShift()
    },
    // 切换shift/默认布局
    handleShift() {
      let currentLayout = this.keyboard.options.layoutName
      let shiftToggle = currentLayout === 'default' ? 'shift' : 'default'
      this.keyboard.setOptions({
        layoutName: shiftToggle,
      })
    },
  },
}
</script>
<!--//这块样式可以根据自己的需求调整-->
<style lang="scss" scoped>

:deep(.hg-row){
  font-weight: lighter;
  background: white;
  .hg-button{
    overflow: hidden;
    padding: 20px 20px;
    background: rgba(92, 173, 255, 0.5);
    span{
      width: 100%;
      height: 100%;
      display: flex;
      align-self: center;
      align-items: center;
      font-size: 34px;
      text-align: center;
      justify-content: center;
    }
  }
}

.hg-candidate-box {
  position: fixed;
  width: 100%;
  font-size: 42px;
  background: rgba(256, 256, 256,1);
  z-index: 9999;

  .hg-candidate-box-list {
    .hg-candidate-box-list-item {
      padding: 0 20px;
    }
  }

}

.hg-rows {
  width: 100% !important;

  .hg-row {
    height: 60px;

    .hg-button {
      height: 60px;
      font-size: 30px;
    }

  }
}

.hg-theme-default {
  width: 100%;
  left: 0;
  position: fixed;
  bottom: 10px;

  .hg-button {
    &.hg-red {
      background: #db3e5d;
      color: white;

      &.close {
        max-width: 200px;
      }
    }

    &.change {
      max-width: 200px;
    }
  }
}
</style>

